高中物理学习困难探源及应对策略

如何教才能教的轻松，让学生也学的明白？教学中发现学生对物理的学习困难分为三类：一种是知识储存量的不足；一种是概念理解的缺陷；还有一种是知识应用程序的混乱。如果在物理教学和学习的过程中，依照从简单到复杂的认知过程，通过丰富知识储备，深入全面理解物理概念及物理规律，明白物理解题的基本程序规律，能够注意对学生从这三方面进行引导和培养，物理应该是最容易教最容易学的科目了。

Necessity Is the Mother of Invention for Research and Extension Agenda of Rubber Smallholders

Researchers and extensionists would pursue their interests to develop new inventions and encourage rubber smallholders to adopt new technology and practices to increase production of their holdings. Three interrelated systems, research and development （R＆D） system, extension/delivery system and client （smallholders） system, are responsible to make the rubber industry viable and dynamic. The extension system is also encouraged to identify and carry out related research activities besides its own core function to enhance clients＇ understanding and to use the findings as basis to plan effective strategies for implementation. Knowledge acquisition among clients is critical in capacity building process. With knowledge, clients tend to develop favorable attitude and use it to develop specific skill to practice recommended technology and new practices. Necessity is the mother of invention in times of need, especially when rubber price is low. Researchers, extensionists and smallholders are ＂forced＂ to collaborate and become creative to fred alternative ways and uses of natural rubber to increase demand of the commodity. When natural rubber price is low, funding for research needs to be maintained at current level, or in some cases, funding is increased to ensure that the industry is not void of new technology and new products. The main goal of the rubber industry is to ensure that new technology and practices are continuously being generated and developed by researchers to be adopted by rubber smallholders. The adoption of new technology and practices by smallholders ensures that production of natural rubber continues to increase, while income of smallholders is maintained or increased at an appreciative level to offset low rubber prices. There is an inclination in the rubber industry that when the commodity＇s price is low, activities and programs related to research and dissemination of research results would follow to be reduced, resulting in stagnation and opportunities for future growth of the industry. The National Blue Ocean Strategy （NBOS） should be used to harness expertise in research among researchers of local universities, as well as to cooperate among extensionists from agencies at state and national levels to help disseminate research results. The NBOS can reduce cost, and has bigger impacts and wider applications of natural rubber for local and international markets.

The Cultural Linguistic Code

For over thirty years I have been researching the origins of language by means of an original and innovative metod. If it consists of considering oral articulation, which produce phonetic sounds as informative gestures and expressions of a visible-expressive code, that precedes the use of phonetic codes. The meaning expressed through each of these articulate-oral gestures was identified through research-responses by two select sample groups of psychotic subjects, chosen because of their greater permeable accessibility to the collective unconscious. In this sense the application of phonetic sounds, that is ＂words＂, is no more than representative or substitutes of the use of pre-articulate oral-facial gestures, used by pre-sapiens to express their informative intentions. Using this method I have published three books, which analyzed precisely and systematically the inter-relationships between consonants in words of Info-european origin--that is the roots of these words--discovering that words sharing common root-consonants do indeed express part or all of their meaning in correspondence with the original meanings of their gestural archetype. The projection into objects of these pre-articulate gestural meanings denotes them by means of mediators＇ metaphors and analogies, this is appearing to be the fundamental reason for the variety of languages, since diverse peoples will use different psychic Freudian puns and methaphors, for the projection to similar object. I have examined over twenty languages, in relation to this generalized cultural code model, founded on biological reactivity to conditions in reality to advantage given its extensive informative use.

SEVERAL CRYPTOGRAPHIC APPLICATIONS OF ∑-PROTOCOL

∑-protocol has been proved to be a very powerful cryptographic tool and widely used in nnmerous important cryptographic applications. In this paper, the authors make use of ∑-protocol as a main tool to resolve the following difficult problems 1-3 and to construct three ettlcient cryptographic protocols 4 6：1） How to construct a protocol for proving a secret integer to be a Blum integer with form PQ, where P, Q are two different primes and both -- 3（mod 4）;2） How to construct a protocol for proving a secret polynomial with exact degree t - 1 iil a （t, n）- threshold secret sharing scheme：3） How to construct witness indistinguishable and witness hiding protocol not from zero-knowledge proof;4） A publicly verifiable secret sharing scheme with information-theoretic security;5） A delegateable signature scheme under the existence of one-way permutations;6） Non-interactive universal designated verifier signature schemes.